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采用田间试验研究施肥水平与杂交水稻产量的关系,以及不同生育阶段养分吸收量,据此,提出了夺取杂交水稻高产的施肥技术。 杂交早稻亩产540公斤,需吸收氮10.9公斤、五氧化二磷4.9公斤、氧化钾15.9公斤、二氧化硅43.8公斤;杂交晚稻亩产560公斤,需吸收氮15.9公斤、五氧化二磷5公斤、氧化钾19公斤、二氧化硅63.8公斤.同一施肥水平,杂交晚稻比杂交早稻多吸收氮20％～27.5％,钾7％～24.1％,磷相似。杂交晚稻秧苗期、分蘖盛期吸钾量高于杂交早稻,齐穗后低于杂交早稻;杂交稻要获高产在氮磷水平中上稻田,施钾是第一位因素,杂交早稻应重视中后期施钾,杂交晚稻应重视苗期及早施钾肥;早晚杂交稻要获超500公斤产量其氮磷钾最佳拖肥量分别为12、4、10.7公斤/亩和12、4、12公斤/亩。
Field experiments were conducted to study the relationship between fertilization level and yield of hybrid rice and nutrient uptake at different growth stages. Therefore, a fertilization technique to seize high yield of hybrid rice was proposed. The yield of hybrid early rice is 540 kilos per mu, which requires absorbing 10.9 kilograms of nitrogen, 4.9 kilograms of phosphorus pentoxide, 15.9 kilograms of potassium oxide and 43.8 kilograms of silica; 560 kilograms of hybrid late rice per mu, 15.9 kilograms of nitrogen to be absorbed and 5 kilograms of phosphorus pentoxide , 19 kg of potassium oxide and 63.8 kg of silica.Under the same fertilization level, the hybrid late rice had 20% -27.5% more nitrogen and 7% -24.1% more nitrogen than the hybrid early rice with similar phosphorus content. Hybrid rice had higher potassium uptake during seedling stage and tillering stage than that of early hybrid rice and lower heading stage than full-heading early hybrid rice. High-yielding hybrid rice had the highest nitrogen and phosphorus level in upper paddy field and potassium application. Late potassium, hybrid late rice should pay attention to seedling and early application of potassium; morning and evening hybrid rice to be super 500 kg yield of the best amount of nitrogen, phosphorus and potassium were 12,4,10.7 kg / mu and 12,4,12 kg / mu.